[asheshouse]

Yes. :oops:

I need to first work out the maximum number of objects that can be loaded.
Don't know if anyone has done this already.
I'll just keep adding objects until it stops loading successfully.

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Now up to 1000000 objects. actors.static is 8Mb

Loads in FMB Mission Editor in 35 sec.
Loads to game from mission briefing screen in 45 sec.
No significant loss of performance except over densely populated areas.
It takes a long time to "create" actors.static

Here's a few statistics for the templates

sk_country_mount - 2.56km2 - 10466 objects - 85KB/km2
sk_DownCity - 0.64km2 - 2175 objects - 175KB/km2
sk_MidCity - 0.64km2 - 1320 objects - 91KB/km2
sk_Factory - 2.56km2 - 14737 objects - 292KB/km2

So looks like I have to be generous with sk_MidCity and sk_country_mount in order to best manage memory usage.